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In the Tools -> Options -> LibreOffice -> Java submenu (on Mac, this is in the LibreOffice -> Preferences submenu), check that a Java runtime environment has been found and recognized, and that the corresponding radio button has been ticked / activated, for the JRE of your choice. If no JRE appears in the window dialog, then either your version of the JRE is not recognized by LibreOffice, or else you do not have a JRE installed, and will have to download and install one accordingly JRE download site .